The British Rail Class 415 (or 4EPB) was a suburban 750 V DC third rail electric multiple unit commissioned by the Southern Region of British Railways. Built between 1951 and 1957, it became the most numerous class on the region after the withdrawal of the 4SUBs. The final trains were withdrawn in the 1990s. The British Rail designation Class 415 was applied to a group of four coach, 3rd rail electric multiple units constructed between 1951 and 1961 and in service from 1951 to 1995.

The 4EPB units (4-car Electro-Pneumatic Brake) were a development of the Southern Railway (SR) 4Sub design, but incorporating electro-pneumatic brakes, unit-to-unit buckeye couplings, roller blind headcode displays in place of the stencil holders used previously, and without external doors to the driver's cab.

One unit, Class 415/1 unit 5176, survives. One of the two "heritage" units (along with 5001), it was repainted in British Rail blue in the early 1990s and survived until the end of EPB workings in 1995. After spending several years in storage, in 1999 the unit was split, with three vehicles going to the Northamptonshire Ironstone Railway Trust and one intermediate trailer vehicle to the Electric Railway Museum, Warwickshire near Coventry. Class pioneer 5001 was also stored at Kineton Ministry of Defence base following withdrawal in 1995 but no buyer could be found and the unit was stripped and sold for scrap in 2004. Only three vehicles remain at the Northamptonshire Ironstone Railway, with Trailer 15354 having been moved from now-closed Electric Railway Museum to the 1:1 Collection Building at Margate, as a donor/spares vehicle for the 4SUB unit 4732.